I need a 3" to 3.5" stainless steel transition for my downpipe. I am thinking of a few methods to make it but i dont know which one is best. The one that sticks out the most in my mind is finding a piece of flat stock stainless (preferably 409Lm if flat stock even exists) heating, rolling it then welding it up (TIG)

does anyone have any suggestions,methods,places to get materials or even pics?
Thanks

 

oops, i meant 409, not 409L

 

never heard of 409. You're not talking about 309 or 308?

If you were using 308, 316 or something, you could buy a reducer...probably off ebay even.

 

The stainless piping i have says 409, the downpipe ss is 409L. I'm assuming you can weld 409 to 309 given the right filler correct?

 

holy microsoft paint sucks .. lol sorry for the big pic ..
409 s.s i belilve was made for the automotive industry b/c its cheaper the 304 and still contains the properties of stainless .(whont rust .) 409 is found on high end production cars for exhaust systems .(gm , chevy, chrys ) .. only thing is 409 turns golden brown .. but whont rust .. i say make it like the photo .. copy a pattern to sheet and roll .. cheap and shouldnt obstruct flow

 

i'm not sure on how long the transition needs to be yet because i havent gotten everything mounted up yet. could you make me one?

 

well one u find out u just plug in the specs u need ... that patter will work for pritty much any size .. 3-2.5 , 4-3 .. ext ... i dont really have the ability to make one for u .. just go to osh and buy some 16 guage s.s sheet ~12bucks .. trace your patter . cut it out .. and figure out a way to rol it .. i say use some worm clamps to hold it wile u tack it .?

 

yea, that'll work. thanks

 

Thats the short taper




We also have a long





Those are some good examples to work off

here is one in action